Design and high-power test of 800-kW UHF klystron for CEPC

doi:10.1088/1674-1056/ac6b26

中国物理B ›› 2022, Vol. 31 ›› Issue (8): 88401-088401.doi: 10.1088/1674-1056/ac6b26

Design and high-power test of 800-kW UHF klystron for CEPC

Ou-Zheng Xiao(肖欧正)^1,†, Shigeki Fukuda², Zu-Sheng Zhou(周祖圣)¹, Un-Nisa Zaib¹, Sheng-Chang Wang(王盛昌)¹, Zhi-Jun Lu(陆志军)¹, Guo-Xi Pei(裴国玺)¹, Munawar Iqbal¹, and Dong Dong(董东)¹

1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
2 High Energy Accelerator Research Organization, KEK, Oho, Ibaraki 305-0801, Japan

收稿日期:2022-02-22 修回日期:2022-04-10 接受日期:2022-04-28 出版日期:2022-07-18 发布日期:2022-07-27
通讯作者: Ou-Zheng Xiao E-mail:xiaooz@ihep.ac.cn
基金资助:
We would like to acknowledge the Institute of Electronics (IE) and Kunshan GuoLi Electronic Technology Company (GLVAC) for their great cooperation. Thank are also due to colleague in accelerator group at IHEP for their valuable contributions. Project supported by Yifang Wang's Science Studio of the Ten Thousand Talents Project.

Design and high-power test of 800-kW UHF klystron for CEPC

1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
2 High Energy Accelerator Research Organization, KEK, Oho, Ibaraki 305-0801, Japan

Received:2022-02-22 Revised:2022-04-10 Accepted:2022-04-28 Online:2022-07-18 Published:2022-07-27
Contact: Ou-Zheng Xiao E-mail:xiaooz@ihep.ac.cn
Supported by:
We would like to acknowledge the Institute of Electronics (IE) and Kunshan GuoLi Electronic Technology Company (GLVAC) for their great cooperation. Thank are also due to colleague in accelerator group at IHEP for their valuable contributions. Project supported by Yifang Wang's Science Studio of the Ten Thousand Talents Project.

摘要/Abstract

摘要： To reduce the energy demand and operation cost for circular electron positron collider (CEPC), the high efficiency klystrons are being developed at Institute of High Energy Physics, Chinese Academy of Sciences. A 800-kW continuous wave (CW) klystron operating at frequency of 650-MHz has been designed. The results of beam-wave interaction simulation with several different codes are presented. The efficiency is optimized to be 65% with a second harmonic cavity in three-dimensional (3D) particle-in-cell code CST. The effect of cavity frequency error and mismatch load on efficiency of klystron have been investigated. The design and cold test of reentrant cavities are described, which meet the requirements of RF section design. So far, the manufacturing and high-power test of the first klystron prototype have been completed. When the gun operated at DC voltage of 80 kV and current of 15.4 A, the klystron peak power reached 804 kW with output efficiency of about 65.3% at 40% duty cycle. The 1-dB bandwidth is ±0.8 MHZ. Due to the crack of ceramic window, the CW power achieved about 700 kW. The high-power test results are in good agreement with 3D simulation.

关键词: klystron, cavity, beam-wave interaction, circular electron positron collider (CEPC), high-power test

Abstract: To reduce the energy demand and operation cost for circular electron positron collider (CEPC), the high efficiency klystrons are being developed at Institute of High Energy Physics, Chinese Academy of Sciences. A 800-kW continuous wave (CW) klystron operating at frequency of 650-MHz has been designed. The results of beam-wave interaction simulation with several different codes are presented. The efficiency is optimized to be 65% with a second harmonic cavity in three-dimensional (3D) particle-in-cell code CST. The effect of cavity frequency error and mismatch load on efficiency of klystron have been investigated. The design and cold test of reentrant cavities are described, which meet the requirements of RF section design. So far, the manufacturing and high-power test of the first klystron prototype have been completed. When the gun operated at DC voltage of 80 kV and current of 15.4 A, the klystron peak power reached 804 kW with output efficiency of about 65.3% at 40% duty cycle. The 1-dB bandwidth is ±0.8 MHZ. Due to the crack of ceramic window, the CW power achieved about 700 kW. The high-power test results are in good agreement with 3D simulation.

Key words: klystron, cavity, beam-wave interaction, circular electron positron collider (CEPC), high-power test

中图分类号: (Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.))

84.40.Fe

29.20.-c (Accelerators)

Ou-Zheng Xiao(肖欧正), Shigeki Fukuda, Zu-Sheng Zhou(周祖圣), Un-Nisa Zaib, Sheng-Chang Wang(王盛昌), Zhi-Jun Lu(陆志军), Guo-Xi Pei(裴国玺), Munawar Iqbal, and Dong Dong(董东). Design and high-power test of 800-kW UHF klystron for CEPC[J]. 中国物理B, 2022, 31(8): 88401-088401.

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[15] EMSYS code
[16] CST Studio suite
[17] Fowkes W R, Caryotakis G, Lee T G, Pearson C and Wright E L 1993 Proceedings of International Conference on Particle Accelerators May 17-20, 1993, Washington, USA, p. 1259
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[21] Ding Y G 2008 Theory and computer simulation of high power klystron (Beijing:National Defense Industry Press) pp. 241-244 (in Chinese)

Design and high-power test of 800-kW UHF klystron for CEPC

Design and high-power test of 800-kW UHF klystron for CEPC

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